问题

________ the working efficiency, the boss allows the employees to have a coffee break. [ ]

A: Improving
B: To improve
C: Having improved
D: Improved

正确答案是：

同类题型

Kathy told me that all the doors and windows _______ when she arrived this morning.

I would like ___ in my noodles.

下列有关文学常识，表述错误的一项是

Mum, I’m thirsty. Would you like to give me , please.

Please don’t make a noise. — . I’ll be as quiet as a mouse.